Supertex (Sunnyvale, CA) has introduced two high-voltage, 32-channel analog switches: HV2801 and HV2901. Both ICs offer robust latch up protection and quiescent current of less than 10 μA, producing optical efficiency in attenuation and controlling high voltage analog switching with a low voltage signal. The ICs are suitable for applications such as diagnostic medical ultrasound imaging. The switches feature 180 ohm on-resistance to minimize return signal attenuation, serial shift registers that reduce I/O connections in space-constrained applications, and up to 200V operating voltage for deeper body tissue imaging capability. Both ICs may be utilized with multiple combinations of high voltage supplies to accommodate different operating modes in diagnostic medical ultrasound imaging, such as +40V/-160V, +100V/-100V, +160V/-40V (Vpp/Vnn). The HV2901 also features integrated bleed resistors to discharge residual DC voltages and reduce erroneous signals.
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